Sequence Of Operation And Timing Charts; Refrigerators - Continuous Operating Mode - Hoshizaki HUR40A(-D) Service Manual

B. Sequence of Operation and Timing Charts
For details on operating modes, see "II.D.4. Operating Modes."
1. Refrigerators – Continuous Operating Mode
a) Sequence of Operation
POWER ON
Board Self Check
1. Frame heater(s) on
2. Evaporator fan(s) on
Cycle On (Cut-on
temperature reached)
[Minimum 2 minutes]
1. Compressor start-up
2. Condenser fan start-up
Continue as
normal cycling
Five minutes after
defrost heater off
1. Compressor on
2. Condenser fan on
Note:
1) Cut-on, cut-off, and cabinet temperature are read by the same sensor, called the
"cabinet thermistor."
2) The defrost thermistor reads the evaporator temperature.
3) There is a five second evaporator fan startup delay when the compressor and
fan would otherwise start together.
2-minute Delay
1. Compressor start-up
2. Condenser fan start-up
Defrost Start
Preprogrammed time interval
1. Compressor off
2. Evaporator fan(s) off
3. Frame heater(s) off (Q6 and later)
4. Condenser fan off
5. Defrost heater on
6. "dF" displayed
Five minutes after
compressor start-up
1. Evaporator fan(s) on
2. Frame heater(s) on
(Q6 and later)
13
Cycle Off (Cut-out
temperature reached)
[Minimum 2 minutes]
1. Compressor off
2. Condenser fan off
Defrost End
Defrost thermistor
reaches defrost
termination temperature,
or defrost timer reaches
1 hour
Defrost heater off
One minute after evaporator
fan start-up "dF" no
longer displayed, cabinet
temperature displayed